Automatic burglar alarm



Jan. 27, 1942. A, Q ECKHARDT l l 2,271,392

AUTOMATIC BURGLAR ALARM' Filed June 7, 1940 d /Wer Patented Jan. 27,1942 holder being displaceable to move fthe "cartridge out of 'the pathof fsaidplunger Whenthefalarm is notfused. V

YAnother object 'of the inventin'istoifprovide an automaticburglary-alarmhavingfa asupprt, a releasable spring-actuatediplungrmountedl in said fsupport, and `a'cartridge `holder pivotally mounted atits -cuter end in said `support #and having its "innerfend'adapt'ed toreceivef-af`car tridge 'and'hold it in 'the path of fsaid-plung'er, saidholdery -being'- manually vn fnvable y"o'nl' its"- pivotal: mounting tobring ithe cartridge? end-out'fof the l pathY of said plunger Ywhen it-is 'notfds'ir'e'd to use'the-alarm. '1 ifi Y AAdditional:objects' ofrthe invntion-a'retolpio vide 'anautomatic burglar``ala-rrn"':vvhi'chylis` if simple construction-.is elcieiti-t in.operationgland which can be renderedinoprative @by cli'spl'acirigv theVcartridge holder thereof.: 5 4" i' With these'and'otherbbject'sin'viewjlm' vention consists in certain'novel'ieatiresfconLstruction'and 'arrangementof parts hereinafter more fully described andclaimed, and illustrated in the accompanying drawing, in which- Figure 1is a front elevational View of my burglar alarm as applied to a door.

Figure 2 is a top plan view thereof.

Figure 3 is a Vertical cross section taken on line 3-3 of Figure 1.

Figure 4 is a similar View but showing the vends ofjak horizontallydispose'dpin I9.,V

y with aligned apertures-"n whichare secured eine' mrrawpernurf-r1 areim axial aiignmemviwith theinnerten'd ofiotchl fly: t' At TheotherendfSpf flanges Il faref'each formed with ya lug or eary I8 projectingV'forwardlyinthe sarne'planel with 'saidifla'nges Lug's I8 are termedthe "andl these apertures Pivotally mount` d yofnmsaid"pinjISadjacentfto said ear I`8 are thel 'ends 2Q fof the ,parallellegst-2v Iof `apartridge;holderl22g This holder. is U shaped and-thebite portion'24' connecting'thef legs 2 I1jis plunger released and the cartridgeheld in a displaced position.

Figure 5 is an enlarged cross section-taken on line 5-5 of Figure 3.

Figure 6 is an enlarged cross section taken on line I-B of Figure 4.

Referring by numerals to the accompanying drawing, I0 indicates asupport which is channelshaped in cross section having longitudinalformed withl an aperturezs-which istljngaxiai alignmentwithithe'apertures I'Lroflugsjl' This l tures" II.

,Sl'idablyf mounted in, A apertures "Ijfflorigitudi nallypf, supportv I0 isa; plunger Z'Igthe' innerend 128 of which is pointedvpresented""against holder y2,2 and cartrid he outerendfw'this plungeris` bent at Lrig yeralfl'y *of fsaidk suppe 1t Whe this'plunjger isock'ed 2.91' .d'SpOSe'dLpa. ,fend bears againstoneidrthe legs formed* bythe notch I5. The pointed end 28 isspaced a suitable distance fromcartridge A. The arm 29.1ies in the path of movement of the movablerclosure member, such as a door, and when the latter is moved into openposition said arm, 29 is moved in an arc to clear the leg of said notchI5 whereupon 'saidy plunger 21 is released and'moves inwardly with theend 28 striking and firing the cartridge A. IThe actuating force of theplunger 2l is supplied l by a coiled compression spring 30 which isposithe force of said spring is increased so that when saidplunger isreleased suilicient force is" produced to fire the cartridge.Y 1 i AWhen the holder 22 is displaced from its ringa position the collar 3|comes to rest against vthe V inner lug I6 and limits the inward movementof said plunger. This holder is displaceable or movable out of its ringposition to prevent acciangle and extendsflat.-

dental discharge of the cartridge when it is not desired to use thealarm.

To move the holder 22 out of its operative or firing position the biteportion 24 is provided with an outward extension 24a to provide a betterhold. The holder is moved away from plunger 21 on the pivot point I9, asshown in Figure 4.

The support I is attached in position by means of screws 32 engaging theweb portion l2 through apertures 33 formed therein. It can be attachedto the vertical member B of a door frame so that the arm 29, when theplunger 21 is cocked, lies in the path of the door C. In the case of awindow, the support I0 is attached on the inside to the bottom rail ofthe upper sash and the arm 29, after the plunger 21 is cocked, isbrought above the top rail of the bottom sash. Thus when the latter ismoved upwardly it engages said arm and releases the plunger.

The end of arm 29 is provided with an aperture 29a for receiving one endofa cord or thin wire, `the other end being connected to a closuremember. Thus the device lI0 can Vbe located remotely from the closureymember.` When said member is opened, the cord pulls on said arm todisengage it from the notched'en'd I4 and release the pin 21.

The coiled spring 26 serves to bringthe cartridge holder 22 to its homeor firing position.

In order to prevent said holder .when moved in inoperative position fromreturning to its home position, suitable means are provided foryieldablylocking said holder in itsV inactive position. This meanspreferably isV in the form ofl protuberances 34 formed on Ythe inside ofthe lower ends I8 and adapted to engage seats 35 formed on Youtsidefaces of side members 2|. 'These protuberances 34 and seats 35 arev soarranged that they are in register with each other only when the holder22 is` in a moved pos'itin, as shown in Figure 4; at other times theyare disengaged and'the holder free to return Vto `its firing position.

In this manner the holder is safely held in inoperative position and theaccidental discharge of the cartridge is prevented.

By mounting the holder 22 movably in member I 0, said holder can beeasily displaced from its ring position and the pin.21 released withoutdanger of discharging the cartridge. VFurthermore, the cartridge can bemore easily replaced,

Arm 29 can be turned to the left or to the right of member l0 to t theclosure member.

While I have shown and described herein the preferred form of myinvention, it is to be understood that various changes in the`construction and arrangement of parts of my burglar alarm can be madewithout departing from the spirit of my invention.

I claim:

1. In an automatic burglar alarm, the combination of a stationarysupport channel-shaped in cross section, a pair of spaced-apart lugsextending transversely from the web portion of said support, a pinslidably mounted in said lugs nand having its upper end bent at rightangle to its axis, a spring for forcing said pin inwardly into firingposition, means on the upper end of said support for engaging said bentend and holding said pin in a retracted position, said bent end beingoperable by the opening of a closure member to release said pin, acartridge holder of inverted Uv-shape having its ends pivotally mountedvto the side flanges of said support and adapted to hold a cartridge ina ring position for said pin, said holder being manually movable fromits vertical position to a horizontally outward position to displacesaid cartridge from ring position, a spring for yieldably maintainingsaid holder in ring position, and cooperating means on said flanges andthe ends of said holder for frictionally retaining said holder in acartridge displaced position against the action of said last mentionedspring.

.2. Ina device of the class described, the combinationv with astationary support channel- VVshaped in cross section and a 'firing pinslidably mounted therein, of a cartridge holder ofinverted U-,shape andhaving its ends pivotally mounted in the flanges of said channel supportsaid` support adapted to hold a cartridge in a firing positionrfor saidpin, said holder being manually movable into a displaced position toplace said cartridge out of striking range of said pin, means forholding said holder in cartridge firing position, and cooperatingprotuberances and seats on rthe anged ends of said support and the endsof said holder for locking said holder in said displaced positionagainst the action Q f said `holding means.

ALBERT G. ECKHARDT.

